Update src/content/docs/dns/manage-dns-records/how-to/managing-dynamic-ip-addresses.mdx

Changed Unix to UNIX.

Co-authored-by: hyperlint-ai[bot] <154288675+hyperlint-ai[bot]@users.noreply.github.com>

Author: SunsetQuest

src/content/docs/dns/manage-dns-records/how-to/managing-dynamic-ip-addresses.mdx

@@ -14,7 +14,7 @@ Create a script to monitor IP address changes and then have that script push cha
 
 ## ddclient
 
-[ddclient](https://github.com/ddclient/ddclient) is a third-party Perl client used to update dynamic DNS entries for accounts on various DNS providers. It works on Linux, macOS, or any other Unix systems.
+[ddclient](https://github.com/ddclient/ddclient) is a third-party Perl client used to update dynamic DNS entries for accounts on various DNS providers. It works on Linux, macOS, or any other UNIX systems.
 
 ## Dynamic-DNS-Record-Updater-For-CloudFlare